根据首字母及句子意思补全单词，使句子意思连贯、语法正确。

1. Look at the sky! The kites are flying so h              that they look like small birds.

2. — Excuse me. How can I get to the post office?

    — Go down this road until you see a tall building. You can't m              it.

3. Mum, I'm h             after a long run. Please give me something to eat.

4. — I advise doing something to relax ourselves after the exams. Do you a              with me?

    — Yes, but how?

5. Most Chinese have three m             a day. They are breakfast, lunch and supper.

流线不能相交（驻点处除外），也不能是折线，因为（），流线只能是一条光滑的（）。